This guy is definitely a psycho
I'm not even you but I'm urged to say some bad things!
He's one of those psychopath that smiles with you and stalks you...
He seems smart but when you're socially deprived you'll turn into a psycho!
Tell her stop contacting this man, have her understand his demeanor.
He's obviously attached to her, but he's too attached.
You need to scare him nice and good...if that fails then take action!